If it's still sealed, should be good. Only powder I had go bad, was some surplus Hogden powder. When I bought it, it was labeled $7.99/lb. Used about 1/2 the can, didn't work out, so put it on the back shelf for at least 15 years. Gave it to a friend of mine that wanted to try some different powders. He told me later, when he opened the can, had a real bad smell to it, so he dumped it. When you open it, smell it. Good powder, doesn't have a real heavy ammonia type smell. gypsyman